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*From*: Bruno Wolff III <bruno wolff to>*To*: Chris Jones <jonesc hep phy cam ac uk>*Cc*: For users of Fedora <fedora-list redhat com>*Subject*: Re: OT : Approximate / fast math libraries ?*Date*: Sat, 1 Sep 2007 10:41:04 -0500

On Sat, Sep 01, 2007 at 11:23:38 +0100, Chris Jones <jonesc hep phy cam ac uk> wrote: > > Talyor expansions are valid when your argument is 'small' i.e. > > sin(x) ~ x > tan(x) ~ x > cos(x) ~ (1-(x)*(x)/2) > > etc. only work when x is small, and the error increases as x does (since the > size of the truncated terms become more important). Yes you can include more > terms but that only allows you to go to large x before the errors explode. Just for the record (i.e. you might already know this) you can do taylor expansions around any point, not just the places where you get the nice looking series. This is still a significant restriction, but in cases where you know you will be doing all of your evaluations near a specific point, this a possibility.

**Follow-Ups**:**Re: OT : Approximate / fast math libraries ?***From:*Mike McCarty

**References**:**Re: OT : Approximate / fast math libraries ?***From:*Mogens Kjaer

**Re: OT : Approximate / fast math libraries ?***From:*Chris Jones